GB/T 8427-2019Textiles - Tests for color fastness - Color fastness to artificial light: Xenon arc (English PDF)

7.2.2.4 of the 2008 edition);

- Modify the L4 corresponding to the light fastness 6 TO L5 (see 8.3.3.6;

7.2.3.4 of the 2008 edition);

- Refine the test procedures of Method 3; INCREASE from 2 contrast blue

wool references to 3 blue wool references (see 8.3.4; 7.2.4 of the 2008

edition);

- Modify the rating stage in Method 4; CHANGE from "grey scale grade 4

and/or 3" to "grey scale grade 4 and 3" (see 8.3.5; 7.2.5 of the 2008 edition);

- Modify "based on the contrasts equal to grey scale grade 4 and grey scale

grade 3 (5.2.9)" (see 9.1; 8.1 of the 2008 edition);

- Modify "a rating of 'less than 1' (or 'less than L2')" (see 9.3; 8.3 of the 2008

edition);

- ADD reporting of assessment result of each period [see Clause 10 c) and

d)];

- Delete the contents of Annexes A, B and C of the previous standard and

integrate and update to Annex C of this Standard;

- Adjust Annex D of the previous standard to Annex A of this Standard;

- Adjust Annex E of the previous standard to Annex B of this Standard;

- ADD Annex D;

- ADD Annex E.

This Standard uses the redraft law to modify and adopt ISO 105-B02.2014

"Textiles - Tests for color fastness - Part B02.Color fastness to artificial light.

Xenon arc fading lamp test".

Compared with ISO 105-B02.2014, the structural changes of this Standard are

as follows.

- EXCHANGE the positions of Clause "Principle" and Clause "Terms and

definitions";

- Delete the subclause number under 5.2.1.4, to avoid further sub-articles

under the untitled article;

- Delete the subclause number under 5.2.1.5, to avoid hanging paragraphs

and further sub-articles under the untitled article;

- Adjust "Annex D" to this Standard "Annex A", "Annex C" to this Standard

"Annex B", "Annex A" to "Annex C", and "Annex B" to "Annex D".

The technical differences between this Standard and ISO 105-B02.2014 and

their reasons are as follows.

- As for the normative references, this Standard has adjusted with technical

differences, to adapt to the technical conditions of China. The adjustments

are mainly reflected in Clause 2 "Normative references". The specific

adjustments are as follows.

 Replace ISO 105-A02 with GB/T 250 which is identical to the

international standard;

 Replace ISO 105-B08 with GB/T 730 which modifies and adopts the

international standard;

 Replace ISO 105-A01 with GB/T 6151 which modifies and adopts the

international standard;

 Replace ISO 3696 with GB/T 6682 which modifies and adopts the

international standard;

 Replace ISO 105-B05 with GB/T 8431 which is equivalent to the

international standard;

 Replace ISO 105-A05 with GB/T 32616 which modifies and adopts the

international standard;

 ADD reference to FZ/T 01047;

 Delete the reference to CIE 51;

- ADD footnote d to Table 2;

- Amend "If the necessary contrast in 8.2.5 is not achieved" in 8.2.7 to "If the

necessary contrast in 8.2.6 is not achieved";

- In Clause 10 c) and d), where the difference between the individual

assessments of the periods exceeds one half grade, change the remark

"grey scale grade of blue reference" to the remark "specific period"; and,

add the reporting of the mean assessment result of color fastness to light;

- In Clause 10 d), delete the reporting of reference sample; in e), delete the

reporting of blue wool reference;

- ADD the descriptions for Figure D.1 and Figure D.2.

This Standard has made the following editorial change.

- CHANGE the standard name to "Textiles - Tests for color fastness - Color

fastness to artificial light. Xenon arc".

Attention is drawn to the possibility that some of the elements of this document

may be the subject of patent rights. The issuing authority of this document shall

not be held responsible for identifying any or all such patent rights.

This Standard was proposed by China National Textile & Apparel Council.

This Standard shall be under the jurisdiction of Technical Committee 209 on

Textiles of Standardization Administration of China (SAC/TC 209).

Drafting organizations of this Standard. Chinatesta Textile Testing &

Certification Services, Q-Lab Corporation Shanghai Representative Office,

Anhui Yuhua Textile Co., Ltd., Wenzhou Darong Textile Instrument Co., Ltd.,

Wenzhou Fangyuan Instrument Co., Ltd., Luthai Textile Co., Ltd., Ningbo Textile

Instrument Factory, SDL Atlas (Shenzhen) Co., Ltd., Jinjiang Chinatesta Testing

Services Co., Ltd., Atlas Material Testing Technology Co., Ltd., Changle Lita

Knitting Co., Ltd., Shanghai Textile Group Testing Standard Co., Ltd.

Main drafters of this Standard. Han Yuru, Li Zhien, Yang Xiaoxiao, Zhang Heng,

Zhang Mengsheng, Cheng Jian, Hu Junwei, Zhang Jianxiang, Jian Zhiguang,

Zhang Zhi, Cao Lingling, Chen Xiaocheng, Chen Siwei, Geng Caihua, Lin Bihua.

The previous editions of the standard replaced by this Standard were released

as follows.

- GB/T 8427-1987, GB/T 8427-1998, GB/T 8427-2008.

Textiles - Tests for color fastness - Color fastness to

artificial light. Xenon arc

6.6 When testing specimens of appreciable thickness, the references shall be

arranged (for example, insert a hard card under the blue wool reference), so

that they are the same distance from the light source as the upper surface of

the test specimens. Covers for the unexposed portions shall avoid surface

compression.

Textiles of appreciable thickness with textured structure which may make

evaluation of small areas difficult, shall be tested with an exposed area not less

than 50 mm x 40 mm and preferably larger.

8.3.4.3 Place the masked card in the test chamber and expose the masked card

to light under the selected exposure conditions in Table 2 until the contrast

between the unexposed and exposed portions of the target blue wool reference

is equal to a grey scale grade 4 (5.2.9) (first period).

8.3.4.5 Replace the masked card in the test chamber and continue to expose

until the contrast between the exposed and unexposed portions of the target

blue wool reference is equal to grey scale grade 3 (5.2.9) (second period).